# Arsine [AsH3] Molecular Weight Calculation

The molecular weight of Arsine [AsH3] is 77.945595.

Arsine [AsH3] is an inorganic compound of two elements: Arsenic (As) and Hydrogen (H). The molecular weight of Arsine is 77.945595 which can be calculated by adding up the total weight (atomic weight multiplied by their number) of all its elements.

# CALCULATION PROCEDURE: Arsine [AsH3] Molecular Weight Calculation

Step 1: Find out the chemical formula and determine constituent atoms and their number in an Arsine molecule.
From the chemical formula, you will know different atoms and their number in an Arsine molecule. The chemical formula of Arsine is AsH3. From the chemical formula, you can find that one molecule of Arsine consists of one Arsenic (As) atom and three Hydrogen (H) atoms.

Step 2: Find out the atomic weights of each atom (from the periodic table).

Atomic weight of Arsenic (As): 74.921595 (Ref: Jlab-ele033, ciaaw-arsenic)
Atomic weight of Hydrogen (H): 1.008 (Ref: Lanl-1)

Step 3: Calculate the molecular weight of Arsine by adding the total weight of all atoms.

Number of Arsenic (As) atoms in Arsine: 1
Atomic weight of Arsenic: 74.921595
Total weight of Arsenic atoms in Arsine: 74.921595 x 1 = 74.921595

Number of Hydrogen (H) atoms in Arsine: 3
Atomic weight of Hydrogen: 1.008
Total weight of Hydrogen atoms in Arsine: 1.008 x 3 = 3.024

Step 4: Calculate the molecular weight of Arsine by adding up the total weight of all atoms.

Molecular weight of Arsine: 74.921595 (Arsenic) + 3.024 (Hydrogen) = 77.945595

So the molecular weight of Arsine is 77.945595.

Arsine [AsH3] Molecular Weight Calculation

## REFERENCES:

• Jlab-ele033: https://education.jlab.org/itselemental/ele033.html
• ciaaw-arsenic: https://www.ciaaw.org/arsenic.htm
• Lanl-1: https://periodic.lanl.gov/1.shtml

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